“In insects, the genes that encode the proteins of the egg membrane, the chorion, become amplified in the surrounding follicle cells.”

“Care was exercised not to separate the amniotic sac into its components, the chorion and amnion.”

“Each embryo is surrounded, from exterior to interior, by the chorion, the vitelline membrane and the embryonic membrane.”

“Thus, the common morphological characteristics of D. dentex, Salmo gairdneri, and other teleostean fish chorions may be explained on the basis of common secondary structure features of their constituent proteins.”

“In solubilized chorions from unfertilized eggs at 10 dpf and 28 dpf, SDS-PAGE resolved five bands, which are similar in size to those found in chorions of other fish species.”